LS7210 Просмотр технического описания (PDF) - LSI Corporation
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LS7210 Datasheet PDF : 4 Pages
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+V
CLOCK
SELECT 4
EXT
6
CLOCK
+V
OSC 5
+V
A2
+V
B1
+V
+V
FIGURE 5. LS7210 BLOCK DIAGRAM
LATCH
CLOCK
SELECT
LOGIC
PRESCALER
÷ 1023
(SEE NOTE)
TIMER
POR
GENERATOR
8 WB4
9 WB3
10 WB2
11 WB1
12 WB0
OUTPUT
LATCH
2
LATCH
CONTROL LOGIC
TRIGGER 3
V SS 14
V DD 7
LATCH
+V
-V
NOTE: ÷ 1023 is standard. Any number from 1 to 1022 can be mask programmed.
FIGURE 6. ASYMMETRICAL FLASHER
+V
13 OUT
+V
.005µF
68K
1
B
2
A
3
TRIG
4
CS
f5
OSC
6 EXT
CLK
7
V DD
f = 3.17KHz
V SS 14
13
OUT
12
WB0
WB1 11
WB2 10
9
WB3
8
WB4
+V
OUT
OUT
323ms
47K
8.068 s
NOTE: Inputs A, B in Dual-Delay mode. For symmetical flasher tie Pins 8, 9, 10, 11 & 12 to fixed logic level.
7210-020298-4
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